The peace that passes understanding is that which delivers us from the FearOfDeath. Phi 4:7 Heb 2:15

There is nothing that can come against us for which Christ has not made us overcomers.

The world is corrupted by sin which has resulted in hatred, violence, sickness, disease and death.
But we are NewSpirit beings InChrist and therefore are more than conquerors in all things. Rom 8:37

Our Faith InChrist realized by the power of His HolySpirit in us enables us to face the issues of life unfazed, actually remaining cheerful through them while waiting for victory.